Submicrometric Iron Particles for the Removal of Pharmaceuticals from Water: Application to b-Lactam Antibiotics

Antoine Ghauch; Habib Baydoun; Al Muthanna Tuqan; Ghada Ayoub; Sahar Naim

doi:10.4028/www.scientific.net/AMR.324.485

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Submicrometric Iron Particles for the Removal of Pharmaceuticals from Water: Application to b-Lactam Antibiotics
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HomeAdvanced Materials ResearchAdvanced Materials Research Vol. 324Submicrometric Iron Particles for the Removal of...

Submicrometric Iron Particles for the Removal of Pharmaceuticals from Water: Application to b-Lactam Antibiotics

Abstract:

Sub-micrometric iron particles (Fe⁰) and amended Fe⁰ (Cu⁰Fe⁰) were tested for the aqueous removal of b-lactam antibiotics. Comparative batch experiments were performed separately on aqueous solutions of dicloxacillin (DCX), cloxacillin (CLX) and oxacillin (OXA). Three different initial concentrations (1, 5 and 10 mg L^-1) and four different iron loads (r = 10, 20, 40 and 53 g L^-1) were tested. Furthermore, two different mixing regimes were tested: (i) non-disturbed conditions, and (ii) vortex mixing. This experimental design enabled the confirmation of the crucial role of in-situ formed iron corrosion products (Fe oxides) on the removal process. The dynamic process of Fe oxides formation induces adsorption and enmeshment (sequestration or co-precipitation) of dissolved antibiotics. Results clearly delineated the superiority of Cu⁰Fe⁰ bimetallics compared to Fe⁰. For example, after 4 h of contact with iron particles at r = 40 g L^-1, OXA, CLX and DCX (10 mg L^-1 each) disappeared to an extent of 31, 46 and 71%. However, quantitative antibiotic removal (~90%) was noticed when Cu⁰Fe⁰ bimetallic was used at lesser load (r = 20 g L^-1)under vortex mixing. On the other hand, non-disturbed systems showed partial removal (~ 25%) of antibiotics over 7 h of reaction at r = 10 g L^-1 (Fe⁰) while almost complete removals were noticed for the Cu⁰Fe⁰ bimetallic system for the same metal load and period e.g. 75, 79 and 86% removal for OXA, CLX and DCX respectively.